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Penta prism
Penta prism is one of the constant angle (90°) beam steering devices. It has two function: first, it deflects the incident light at a certain angle (90°), regardless of the Angle of incidence on the first side; Second, unlike right angle prism, the image it creates has neither rotation nor mirror reflection. Penta prism are commonly used in camera viewfinders, image observation systems、measuring instruments.
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